The power received by the SPS rectenna is found by integrating power density over the reception area: Received power is now a function of Ai - Anlc, and RT and Rc. Other micro wave beam characteristics may also be found from Eqs. 5 and 6. The power transmitted by the antenna, PT, is From the standpoint of minimizing electricity cost, it was shown previously (Eq. 3) that mills/kWh cost can be formulated as a simplified function of PG, PT, RT, and RG, with cost penalties added to constrain thermal, ionospheric, and sidelobe power densities within bounds:
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